I recently found my self unable to read due to a very powerful storm knocking out the power where I was, so when I could get on line again I searched for a light for my Kindle and purchased the e-luminator, it's absolutely brilliant.
I can even read in bed without disturbing my partner by having a bedside light on.
I do have a case for my Kindle which I think helps because I am able to tuck it in down the back when the case is folded back and it stays in place and being able to angel the lamp to point exactly where I need is perfect.
I think this is a great little gadget and running on AAA batteries means its not heavy or bulky, I can drop it in my bag along with my Kindle.
I purchased to use with my Kindle but I am sure it can be used for many other types of books and more, it was a great buy and good value for money.